Stockholders' equity - Common Stock and Receivable from Shareholder (Details) - shares |
Dec. 31, 2020 |
Dec. 31, 2019 |
Feb. 13, 2013 |
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| Equity [Abstract] | |||
| Common stock, shares outstanding | 24,850,261 | 24,849,261 | |
| Preferred stock, shares authorized | 10,000,000 |
| X | ||||||||||
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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